干旱区研究2018，Vol.35Issue(2)：436-443,8.DOI:10.13866/j.azr.2018.02.23
干旱区典型城市云对太阳辐射的影响
Effects of Clouds on Solar Radiation over Typical City in Arid Area
摘要
Abstract
The ecological environment in arid and semiarid areas is very fragile and sensitive to climate change. The change of solar radiation is very important to climate and ecological environment.The effects of clouds on solar radiation are significant.In this study, the effects of clouds on solar radiation over Urumqi, a typical semiarid city, were studied so as to provide a scientific basis for improving the accuracy of predicting climate change in the region using the data with high temporal and spatial resolution and the long-term series of Single Scanner Footprint TOA/Surface Fluxes and Clouds (SSF) dataset, CER_SSF_Aqua-FM3-MODIS_Edition3A dataset from the Earth's Ra-diant Energy System (CERES) of NASA's EOS (The NASA Earth Observing System).Another purpose of this study was to examine the annual and inter-annual variations of solar radiation, cloud physical properties and cloud shortwave radiative forcing over Urumqi during the period from January 2006 to December 2015.The results showed that the annual distribution curves of net surface shortwave radiation flux and the shortwave radiation flux at the top of atmosphere on clear day were unimodal.The peak values, 187.5 W·m-2 and 792.3 W·m-2, occurred in June and May respectively.The cloud radiative forcing at both the top of atmosphere and on the surface were negative, i. e. -253.7 W·m-2 and -249.0 W·m-2 respectively.The annual distribution of cloud shortwave radiative forc-ing kept a downward trend.The inter-annual average values of cloud shortwave radiative forcing for 10 years were close to a symmetrical unimodal distribution.The peaks values, -391.3 W·m-2 and -355.0 W·m-2, occurred in July.Seasonally, the values were the highest in summer but the lowest in winter, and they were slightly higher in spring than in autumn.There was a similarity in annual variation of cloud physical parameters and cloud shortwave radiative forcing.The total cloud cover in winter was low, and its maximum value occurred in June.Cloud optical depth peak values, 22 and 26.1, occurred in July and November respectively, and the minimum value (6.1) oc-curred in February.The maximum value (263.5 K) and the minimum value (242.6 K) of cloud equivalent tem-perature occurred in June and February separately.关键词
CERES(SSF)/云短波辐射强迫/云物理属性/时间变化/乌鲁木齐Key words
CERES (SSF)/cloud shortwave radiative forcing/cloud physical property/temporal variation引用本文复制引用
陈春美,钟珂,陈勇航,秦榕,辛渝,陈彬,刘琼,周黛怡..干旱区典型城市云对太阳辐射的影响[J].干旱区研究,2018,35(2):436-443,8.基金项目
国家自然科学基金(41375021,91644211,41675026,41590871) （41375021,91644211,41675026,41590871）
